rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on Jul 16, 2008 14:23:57 GMT -5
I was out searching around on Grainger.com and found they have Aluminum Oxide in 36 and 80 grit for less than I can buy Silicon carbide in the same grid. Would Aluminum Oxide 80 grit perform the same way as 60-90 grit Silicon Carbide?
Just looking for a cheaper deal on 60/90 grit. I go through 50 lbs in 3-4 months...
Rick
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Post by Toad on Jul 16, 2008 14:26:34 GMT -5
i beilieve silicon carbide is much harder 9.25 Mohs. But to be honest, I don't know the Moh's for Aluminum oxide
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rollingstone
starting to spend too much on rocks
Member since July 2009
Posts: 236
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Post by rollingstone on Jul 16, 2008 15:05:35 GMT -5
Not much difference in hardness -- aluminum oxide is corundum, which defines Mohs hardness 9. The difference is that aluminum oxide becomes smooth as it wears down so becomes like tiny ball bearings. SiC is brittle so breaks into jagged shards as it wears down, so it keeps cutting much longer than AlO.
-Don
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rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on Jul 16, 2008 16:50:08 GMT -5
Thanks Don,
That was the answer I was looking for. Looks like I best stick to Silicon Carbide for my 1st stage tumbling...
Rick
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